iOS 网络篇—PDF网络文件下载和打开

最近的项目要用到一个在线报告的下载，于是完成后自己在理一下思路，大体的实现了我要得需求。

话不多说，直接上代码

首先，取到网络文件的链接，进行判段是否需求再次下载还是直接打开

第一步、是否下载还是打开文件

- (void)downloadPDF:(NSString *)downloadUrl{

    NSArray *array = [downloadUrl componentsSeparatedByString:@"/"]; //从字符/中分隔成多个元素的数组

    NSString *file = [array lastObject];

    if ([self isFileExist:file]) {

        //获取Documents 下的文件路径

        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

        NSString *path = [paths objectAtIndex:0];

        NSString *pathString = [path stringByAppendingFormat:@"/%@",file];

        NSLog(@"path:%@", pathString);

        [self loadDocument:pathString];

    }else{

        //从新下载

        [self downloadFile:downloadUrl];

    }

}

第二步、判断沙盒中是否存在此文件

-(BOOL) isFileExist:(NSString *)fileName

{

    //获取Documents 下的文件路径

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *path = [paths objectAtIndex:0];

    NSString *filePath = [path stringByAppendingPathComponent:fileName];

    NSFileManager *fileManager = [NSFileManager defaultManager];

    BOOL result = [fileManager fileExistsAtPath:filePath];

    NSLog(@"这个文件已经存在：%@",result?@"是的":@"不存在");

    return result;

}

第三步、下载PDF

- (void)downloadFile:(NSString *)downLoadUrl{

    __weak typeof(self)weakSelf = self;

    [self hudTipWillShow:YES];

    [DataService downloadTaskWithURL:downLoadUrl completion:^(id result) {

        NSLog(@"%@",result);

        NSProgress *downloadProgress = result;

        if (weakSelf.HUD) {

            weakSelf.HUD.progress = downloadProgress.fractionCompleted;

            _HUD.labelText = [NSString stringWithFormat:@"%2.f%%",downloadProgress.fractionCompleted*100];

        }

    } filesPath:^(id filesPath) {

        [_rePortDwn setBackgroundImage:[UIImage imageNamed:@"downLoad"] forState:UIControlStateNormal];

        //        NSLog(@"%@",filesPath);

        NSURL*urlString = filesPath;

        NSString *string = [urlString absoluteString];

        NSArray *array = [string componentsSeparatedByString:@"/"]; //从字符A中分隔成2个元素的数组

        NSString *file = [array lastObject];

        NSLog(@"filePathName = :%@",file);

        [weakSelf hudTipWillShow:NO];

    }];

}

第四步、已经下载了的文件用webview显示

-(void)loadDocument:(NSString *)documentName

{

    UIWebView *webView = [[UIWebView alloc]initWithFrame:CGRectMake(0, 64, kSCREEN_WIDTH, kSCREEN_HEIGHT)];

    [self.view addSubview:webView];

    NSURL *url = [NSURL fileURLWithPath:documentName];

    NSURLRequest *request = [NSURLRequest requestWithURL:url];

    [webView loadRequest:request];

}

最后，直接调用第一步的方法就可以了。

这其中没有做断点续传，日后有遇到再更新！ 欢迎提出和指正